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{- Freedesktop.org specifications
-
- http://standards.freedesktop.org/basedir-spec/latest/
- http://standards.freedesktop.org/desktop-entry-spec/latest/
- http://standards.freedesktop.org/menu-spec/latest/
- http://standards.freedesktop.org/icon-theme-spec/latest/
-
- Copyright 2012 Joey Hess <id@joeyh.name>
-
- License: BSD-2-clause
-}
{-# OPTIONS_GHC -fno-warn-tabs #-}
module Utility.FreeDesktop (
DesktopEntry,
genDesktopEntry,
buildDesktopMenuFile,
writeDesktopMenuFile,
desktopMenuFilePath,
autoStartPath,
iconDir,
iconFilePath,
systemDataDir,
systemConfigDir,
userDataDir,
userConfigDir,
userDesktopDir
) where
import Utility.Exception
import Utility.UserInfo
import System.Environment
import System.FilePath
import System.Directory
import System.Process
import Data.List
import Data.Maybe
import Control.Applicative
import Prelude
type DesktopEntry = [(Key, Value)]
type Key = String
data Value = StringV String | BoolV Bool | NumericV Float | ListV [Value]
toString :: Value -> String
toString (StringV s) = s
toString (BoolV b)
| b = "true"
| otherwise = "false"
toString (NumericV f) = show f
toString (ListV l)
| null l = ""
| otherwise = (intercalate ";" $ map (concatMap escapesemi . toString) l) ++ ";"
where
escapesemi ';' = "\\;"
escapesemi c = [c]
genDesktopEntry :: String -> String -> Bool -> FilePath -> Maybe String -> [String] -> DesktopEntry
genDesktopEntry name comment terminal program icon categories = catMaybes
[ item "Type" StringV "Application"
, item "Version" NumericV 1.0
, item "Name" StringV name
, item "Comment" StringV comment
, item "Terminal" BoolV terminal
, item "Exec" StringV program
, maybe Nothing (item "Icon" StringV) icon
, item "Categories" ListV (map StringV categories)
]
where
item x c y = Just (x, c y)
buildDesktopMenuFile :: DesktopEntry -> String
buildDesktopMenuFile d = unlines ("[Desktop Entry]" : map keyvalue d) ++ "\n"
where
keyvalue (k, v) = k ++ "=" ++ toString v
writeDesktopMenuFile :: DesktopEntry -> String -> IO ()
writeDesktopMenuFile d file = do
createDirectoryIfMissing True (takeDirectory file)
writeFile file $ buildDesktopMenuFile d
{- Path to use for a desktop menu file, in either the systemDataDir or
- the userDataDir -}
desktopMenuFilePath :: String -> FilePath -> FilePath
desktopMenuFilePath basename datadir =
datadir </> "applications" </> desktopfile basename
{- Path to use for a desktop autostart file, in either the systemDataDir
- or the userDataDir -}
autoStartPath :: String -> FilePath -> FilePath
autoStartPath basename configdir =
configdir </> "autostart" </> desktopfile basename
{- Base directory to install an icon file, in either the systemDataDir
- or the userDatadir. -}
iconDir :: FilePath -> FilePath
iconDir datadir = datadir </> "icons" </> "hicolor"
{- Filename of an icon, given the iconDir to use.
-
- The resolution is something like "48x48" or "scalable". -}
iconFilePath :: FilePath -> String -> FilePath -> FilePath
iconFilePath file resolution icondir =
icondir </> resolution </> "apps" </> file
desktopfile :: FilePath -> FilePath
desktopfile f = f ++ ".desktop"
{- Directory used for installation of system wide data files.. -}
systemDataDir :: FilePath
systemDataDir = "/usr/share"
{- Directory used for installation of system wide config files. -}
systemConfigDir :: FilePath
systemConfigDir = "/etc/xdg"
{- Directory for user data files. -}
userDataDir :: IO FilePath
userDataDir = xdgEnvHome "DATA_HOME" ".local/share"
{- Directory for user config files. -}
userConfigDir :: IO FilePath
userConfigDir = xdgEnvHome "CONFIG_HOME" ".config"
{- Directory for the user's Desktop, may be localized.
-
- This is not looked up very fast; the config file is in a shell format
- that is best parsed by shell, so xdg-user-dir is used, with a fallback
- to ~/Desktop. -}
userDesktopDir :: IO FilePath
userDesktopDir = maybe fallback return =<< (parse <$> xdg_user_dir)
where
parse s = case lines <$> s of
Just (l:_) -> Just l
_ -> Nothing
xdg_user_dir = catchMaybeIO $ readProcess "xdg-user-dir" ["DESKTOP"] []
fallback = xdgEnvHome "DESKTOP_DIR" "Desktop"
xdgEnvHome :: String -> String -> IO String
xdgEnvHome envbase homedef = do
home <- myHomeDir
catchDefaultIO (home </> homedef) $
getEnv $ "XDG_" ++ envbase
|
